Sewing and edging machine



Oct. 9, 1928.

' K. MAIER SEWING AND EDGING MACHINE Filed Aug, 5, 1926 4 Sheets-Sheet 1 i llu=l=mnmnlu Oct. 9, 1928. 1,687,377

' K. MAIER SEWING AND EDG'ING MACHINE Fi A g- 1926 4 Sheets-Sheet 2 I v K. MAIER SEWING AND EDGING MACHINE Filed-Aug. 5, 1926 4 Shee'ts-Sheet 5 Oct. 9, 1928.

K. MAIER SEWING AND EDGING MACHINE Filed Aug. 5, 1926 4 Sheets-sheaf 4 Patented Oct. 9, 19 28.

' UNITED STATES PATENT OFF-ICE.

KARL MAIER, 0F STUTTGABT, GERMANY, ASSIGNOR TO UNION SPECIAL MASCHIHEN FABRIK, G. M. B. 11., 0F STUTTGABT, GERMANY.

snwnve AND EDGING MACHINE.

Application filed August 3, 1926, Serial No. 126,844, and in Germany August 24, 1925.

The invention relates to new and useful improvements in sewing machines, and more particularly to a sewing machine of the tv e shown in the United States Patent 0. 1,266,884, granted R. B. Thompson, May 21, I918. The above machine is adaptedfor forming and stitching an edging to the edge of a body material, and includes vibrated needles which are spaced from each other, a tape guide for directing the tape between the needles, and thread laying fingers for laying an edging thread above and below the tape so that the stitching threads join the edgingthreads to ether, and also join the edging threads to tile body fabric.

An object of. the present invention is to rovide a machine of the above type wherem the path of .travel of the thread laying fingers which form the edging is capable of adjustment sothat said path of travel may be properly disposed relative to the needles.

A further-object of the invention is to provide athread controlling device for the threadlaying fingers which form the edging, which is shiftable with the shifting of the oscillating position of the thread fingers, so

that for all adjustments of the thread fin-' gers, a uniform thread control on the edging threads may be obtained.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings which show by way of illustration one embodiment of the invention-' Figure 1 is. a front view of a machine embodying the improvements, certain of the parts being omitted for the sake of clearness;

Fig. .2 is a view from the rear of the ma chine of the parts adjacent the needle head,

many of the parts being omitted for the sake of clearness, and many of the parts being shown only diagrammatically; 1

Fig. 3 is a View, more or less diagrammatic, showing the means for supporting the thread laying fingers, which form the edging, the View being taken from the front of the machine;

Fig. 4 is a similar view from the rear side of the machine.

Fig. 5 is a view partly in plan and partly in section, showing the bracketfor supporting the thread laying fingers, and also showing the thread control for the thread laying fingers;

Fig. 6 is a View partly in section and artly in plan of the main parts shown in Flg. 5, and showing in broken lines the adjustment of the support for the thread laying fingers;

Fig. 7 is a sectional view on the line 2-2 of Fig. 6;

Fig. 8 is a plan view showing the thread laying devices, the support therefor, and the thread controller fo said thread laying devices, said thread laying devices being shown in full lines in the intermediate position and in dot and dash lines in the most forward and the most rearward positions of the thread laying devices, and also showing in dot and dash lines the movement of the thread controlling device, and

.the needles and the shifted position of the thread laying fingers.

The invention is directed to a machine for forming an edging on a body fabric of the type shown in the Thompson patent above referred to. In this patent, there are two. needles carried by a needle bar which is mountedin a needle gate, which needle gate in turn is vibrated laterally, so that the needles form two independent rows of zig-zag stitches. Suitable complemental stitch forming devices cooperate with the needles beneath the material. A' tape is guided by a suitable tape guide between the needles. Thread laying fingers are provided which oscillate back and forth in front of the needles, one of said thread laying fingers moving above the tape and the other belowthe tape. These thread laying fingers operate only at intervals as compared with the formation of the zigzag stitches, and the needle threads join the loops formed by the edge form'ng fingers to the body fabric and to each other, one needle operating at one side of the tape and the other operating at the other side of the tape. There are other features in the Thompson machine referred to, but it will not be necessary to refer more. 1n detail to them in order to understand the present invention.

The present invention is directed particularly to the mounting of the thread laying fingers. These thread laying fingers swlng about a pivotal center on a bracket carried by the head of the machine. According to the present invention, this bracket is made 1n two parts, and one is adjustable relative to the other for shifting the center of oscillation of the thread laying fingers. The shaping of the parts is such that when the needles are set comparatively close together or at considerable distance apart in the setting up of the machine, then the center of oscillation of the thread laying fingers can be shifted so as to maintain a predetermined distance between the paths of movement of the thread laying fingers and the needles. This enables the machine to be readily set up and adjusted for inserting the desired width of tape. Another feature of the present invention is the thread controlling device for the threads of the thread laying fingers. This is a yielding device, and is mounted on the shiftable part which supports the thread fingers, so that when the thread fin ers are shifted, the thread control will be liiewise shifted and always maintain the same position relative thereto.

Referring more in detail to the drawings, the present improvement is shown as applied to a machine including a base 1 having an overhangin arm 3. Mounted to oscillate on the over anging arm is a needle lever 7 which reciprocates a needle bar (3. This needle bar 6 carries two needles 12 and 13. Cooperating with the needles 12 and 13 are the thread laying fingers 54' and 55. These thread laying fingers 54:. and 55 are mounted in an arm 61 carried by a short shaft which in turn is mounted in a bearing E, and said arm swings about a center 62 which is the center of the bearing E. At the upper end of the shaft carrying the arm 61, there is an arm which is connected to the link 65, and the link 65 is in turn connected to'a lever arm 67. This lever arm 67 carries a roller 69 running in a cam groove 70 in a cam druln'll. This cam drum is driven by suitable gearing from the main shaft 11. The parts so far described are all shown in detail in the Thompson patent, and further description is not thought necessary. The needle bar 6 is mounted to reciprocate in a needle gate which in'turn is mounted to swing about a vertical axis on the needle head 4. Attached to this gate is an arm 81 and the arm 81 is connected to a rock lever 82 which carries a roller 83 runnlng in a cam groove 84. Through this cam groove which is rotated by the main shaft the needle bar is vibrated laterally. This structure is shown and described in deferred to.

A small bearing block A is secured to the head 4. of the .sewing machine by a screw B. This bearing block A has a rib and groove connection C with the head of the machine. This bearing block A is provided with a curved bearing surface D which is slightly eccentric to the axis of the needle bar carrying the needles 12 and 13. The hearing E is carried by a support S. This support has a rib F adapted to engage a groove in the bearing block 'A. The .support S is provided with an elongated slot H, and a screw Gr passingthrough said slot is threaded into the bearing block A. When this screw G is loosened, the support S can i with a suitable thread eye 57, while the thread laying finger 55, which is immediately below the thread laying finger 54, is likewise provided with a thread eye which is directly beneath the thread eye 57. The thread laying finger 54 is provided with suitable thread guides through which the thread Q passes. This'is one of the edge forming threads. The thread laying finger 55 has suitable thread guides for the edge forming thread Q. These threads Q and Q. pass through thread eyes M in the thread controller. Mounted on the support S which carries the thread laying fingers is a sleeve hearing J. Said bearing is secured to the support by a screw K. A wire extends through the guide bushing L in the sleeved, and this wire carries the thread eye M. Said wire is; secured to the bushing, and the bushing has a limited movement in the sleeve J. A spring P normally forces the bushing outwardly and thus moves the thread eyes M to their extreme outer position; Said bushing is provided with a groove 0 and a screw N carried by the sleeve J extends into this groove 0 ani thus limits the movements of the three eyes. The needle threads are illustrated in the drawings at B and B. When the thread layin fingers move forward, the threads Q. and (3' passing through the thread eyes M will move the thread eyes forward, compressing the spring P. This gives upsuflicient thread for the laying of the edging threads, and while the thread fingers are at the for- Ward end of their stroke, the needle 12 will secure the edging thread to the fabric. On the retracting movement of the thread laying fingers, the spring P will move the thread eyes M, and thus take up the thread. These thread eyes give up thread to the thread laying fingers, and take care of the slack formed by the retracting movement of said fingers. They also aid inthesupplying of the thread for the forming of the edging.

The spring allows the thread eyes to yield under a strain on the threads and thus the breaking of the needle threads is avoided. As shown in full lines, in Fig." 9, the needles are set a distance apart indicated by the line the thread fingers 54 and 55 to be shifted.

This is accomplished by loosening the screw G and shifting the support S which carries the bearing E in which the thread fingers oscillate. By thus shifting the support, the center of oscillation 62 of the thread fingers can be shifted as indicated in Figures 6 and 9. When the bearing E is set in the position indicated in full lines in Fig. 9, the distance between the center line of the needles indicated by I0 and the center line of the eye is indicated by X in Fig. 9. This distance betwen the thread laying fingers and the needles should be maintained for all settings of the needles, and the shifting of the support S from the position I indicated in Fig. 9, to the position II accomplishes this result. In other words, when the needles are set for a different width tape, thesupport S for the thread laying fingers is shifted, so that the path of movement of the thread eyes of the thread laying fingers relative to the center line of the needles is substantially the same. Inasmuch as the supporting sleeve J for the thread eyes M is mounted on the support S, it will be shifted with the support, and therefore, the thread eyes will always maintain the same operative relation to the thread fingers for the various settings thereof. i

It is obvious that minor changes in the details of construction and arrangement of the parts ma be made without departing from the spirit of'the invention as set forth in the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is-

1. A sewing machine including'in combination, oscillating thread laying fingers for forming edging loops, stitch forming mechanism including a pair of'needles for securing the edging loops to a body material, means for oscillating said thread laying fingers, and means for shifting the center of oscillation of said thread laying fingers.

2. A sewing machine including in combination, oscillating thread laying fingers for forming edging loops, stitch forming mechanism including a pair of needles for securing the edgingloops to a body material, means for oscillating said. thread laying fingers, means for shifting the center of oscillation of said thread laying fin ers, a

yielding thread controlling device or the edging threads shiftable with the thread laying fingers so that when said thread laying fingers are repositioned as to their center of oscillation, the thread controlling device maintains its same relative position to the thread layin devices.

3. A sewing mac ine including in combination thread laying fingers for forming .edging loops, stitch forming mechanism including a pair of needles, means for supporting said thread laying fingers, means for oscillating the thread laying fingers on the support, means for ad usting the support on which said thread laying fingers oscillate so as to shift the path of oscillation of the thread laying fingers relative to the needles, whereby said thread laying fingers may be positioned so as to oscillate in a path at a predetermined distance from the needles.

4. A sewing machine including in combination thread laying fingers for forming edging loops, stitch forming mechanism including a pair of needles, means for supporting said thread laying fingers, means for oscillating the thread laying fingers on the support, means for adjusting the support on which said thread laying fingers oscillate so as to shift the path of oscillation of the thread laying fingers relative to the needles, whereby said thread laying fingers may be positioned so as to oscillate in a path at a predetermined distance from the needles, and a 'thread controlling device for the threads of the thread laying fingers mounted on and shifta'ble with the support on which said thread laying fingers oscillate.

5. A sewing machine including in combination, thread laying fingers arranged one above the other for laying edging threads in loops, a pair of needles, means for vibrating said needles, a support on which the thread laying fingers are mounted for oscillation, a bracket to which said support is adjustably attached whereby said support shiftahle therewith.

7. A sewing machine including in combination, osc1llat1ng thread laying fingers for forming edging loops, stltch forming mechanism includinga pair of needles for securing the edging loops to a hody material, means for oscillating said thread laying fingers, and means for shifting the center of oscillation of said thread laying fingers,

thread eyes for the threads of the thread laying fingers and means for permitting the movement of said eyes so as to supply thread to said fingers on the forward movement, and-for moving said eyes so as to take "up Leena-2"? the slack thread on the backward movement of said fingers.

8. A sewing machine including in combination, oscillating thread laying fingers for forming edging loops, stitch forming mech-.

anism including a pair of needles for securing the edging loops to a body material, means for oscillating said thread laying fingers, means for shifting the center of eseillation of said thread layin fingers, thread eyes for the threads of the thread laying fingers, means for permitting the movement of said eyes so as to supply thread to said fingers on the forward movement and for moving said eyes so as to take up the slack thread on the backward movement of said fingers, and means. for yieldingly supporting said thread eyes.

In testimony whereof, I afiix my signatare.

KARL MAIER. 

